1. Waterproof and windproof. 2. Continuous heating for 4-5 hours 3. Suitable for outdoor and motorcycle 4. Easy to carry Technical data1. Li-on battery: 3.7V 2600mA2. Temperature: 40-50C3. Working time: 4-5 hours with full power4. Size: S M L XL5. Input of charger: AC 100-220V with Europe standard plugFunction1, Waterproof2, Flexible3, Comfortable4, Durable5, Netwest Design6, Ventilative7, Soft8, ...